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pkg/api: use a rwlock when accessing storage

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The original patch used a mutex, however, the workload patterns are
likely to be read-heavy, so use a rwlock instead.
This commit is contained in:
Ramkumar Chinchani 2020-03-20 10:56:19 -07:00
parent fe471a3c35
commit 2fd87b6a86
2 changed files with 20 additions and 10 deletions
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26
pkg/api/routes.go
View file

@ -42,17 +42,27 @@ const (
type RouteHandler struct {
c *Controller
blobLock sync.Mutex
blobLock sync.RWMutex
}
func NewRouteHandler(c *Controller) *RouteHandler {
rh := &RouteHandler{c: c, blobLock: sync.Mutex{}}
rh := &RouteHandler{c: c, blobLock: sync.RWMutex{}}
rh.SetupRoutes()
return rh
}
func (rh *RouteHandler) blobLockWrapper(f func (w http.ResponseWriter, r *http.Request)) func (w http.ResponseWriter, r *http.Request) {
// blobRLockWrapper calls the real handler with read-lock held
func (rh *RouteHandler) blobRLockWrapper(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
rh.blobLock.RLock()
f(w, r)
rh.blobLock.RUnlock()
}
}
// blobLockWrapper calls the real handler with write-lock held
func (rh *RouteHandler) blobLockWrapper(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
rh.blobLock.Lock()
f(w, r)
@ -67,23 +77,23 @@ func (rh *RouteHandler) SetupRoutes() {
g.HandleFunc(fmt.Sprintf("/{name:%s}/tags/list", NameRegexp.String()),
rh.ListTags).Methods("GET")
g.HandleFunc(fmt.Sprintf("/{name:%s}/manifests/{reference}", NameRegexp.String()),
rh.CheckManifest).Methods("HEAD")
rh.blobRLockWrapper(rh.CheckManifest)).Methods("HEAD")
g.HandleFunc(fmt.Sprintf("/{name:%s}/manifests/{reference}", NameRegexp.String()),
rh.GetManifest).Methods("GET")
rh.blobRLockWrapper(rh.GetManifest)).Methods("GET")
g.HandleFunc(fmt.Sprintf("/{name:%s}/manifests/{reference}", NameRegexp.String()),
rh.blobLockWrapper(rh.UpdateManifest)).Methods("PUT")
g.HandleFunc(fmt.Sprintf("/{name:%s}/manifests/{reference}", NameRegexp.String()),
rh.blobLockWrapper(rh.DeleteManifest)).Methods("DELETE")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/{digest}", NameRegexp.String()),
rh.CheckBlob).Methods("HEAD")
rh.blobRLockWrapper(rh.CheckBlob)).Methods("HEAD")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/{digest}", NameRegexp.String()),
rh.GetBlob).Methods("GET")
rh.blobRLockWrapper(rh.GetBlob)).Methods("GET")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/{digest}", NameRegexp.String()),
rh.blobLockWrapper(rh.DeleteBlob)).Methods("DELETE")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/uploads/", NameRegexp.String()),
rh.blobLockWrapper(rh.CreateBlobUpload)).Methods("POST")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/uploads/{session_id}", NameRegexp.String()),
rh.GetBlobUpload).Methods("GET")
rh.blobRLockWrapper(rh.GetBlobUpload)).Methods("GET")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/uploads/{session_id}", NameRegexp.String()),
rh.blobLockWrapper(rh.PatchBlobUpload)).Methods("PATCH")
g.HandleFunc(fmt.Sprintf("/{name:%s}/blobs/uploads/{session_id}", NameRegexp.String()),

4
pkg/storage/storage.go
View file

@ -35,7 +35,7 @@ type BlobUpload struct {
// ImageStore provides the image storage operations.
type ImageStore struct {
rootDir string
lock *sync.Mutex
lock *sync.RWMutex
blobUploads map[string]BlobUpload
log zerolog.Logger
}
@ -43,7 +43,7 @@ type ImageStore struct {
// NewImageStore returns a new image store backed by a file storage.
func NewImageStore(rootDir string, log zlog.Logger) *ImageStore {
is := &ImageStore{rootDir: rootDir,
lock: &sync.Mutex{},
lock: &sync.RWMutex{},
blobUploads: make(map[string]BlobUpload),
log: log.With().Caller().Logger(),
}